A Hardin County man's trial was dismissed on Wednesday because the lead investigator in the case is the target of a federal investigation, said District Attorney David Sheffield.

Sheffield said Toby Langham's sexual misconduct case had to be dismissed because Sheffield learned that Hardin County Sheriff's Office Sgt. Jerry Roberts, the lead investigator in Langham's case, was being investigated for child pornography allegations.

Sheffield said the defense would have used that information during the trial to hurt the prosecution's case.

Last year, Langham was indicted on charges of sexual assault of a child, indecency by exposure, and sexual performance of a child.

Sheffield said his office will review the charges against Langham and see what can be brought back to a grand jury for possible re-indictment.